What slope should collection lines in a sand filter have?

The appropriate slope for collection lines in a sand filter is established to ensure effective drainage and prevent potential issues such as clogging and backup. A slope of 6 inches per 100 feet allows for adequate flow while maintaining the necessary retention time for the wastewater treatment process. This gentle gradient promotes a consistent flow in the collection lines, facilitating proper filtration through the sand media.

Using a slope that is too steep can result in excessive velocity, which might carry solids and other particulates through the system without adequate treatment. Conversely, a slope that is too shallow might lead to stagnation, where the wastewater doesn't move efficiently, risking clogging and reducing overall system performance. By adhering to the recommended 6 inches per 100 feet slope, systems are optimized for both efficiency and effectiveness in treating wastewater.